Roundtrip Denver to Seattle Nonstop Airfares

No special codes or coupons are required. Get these roundtrip airfares while they are available. These basic economy fares are offered by Southwest Airlines, Alaska Airlines, and United Airlines.

• On United, a personal item is allowed.
• On Alaska and Southwest, a personal item and a carry-on bag are permitted.
• United and Alaska will seat children accompanied by adults together.

Travel Availability

• Departing Denver (DEN): November 4-19; December 3-17
• Departing Seattle (SEA): November 4-6, 8-19; December 3-16